package com.example.apigateway.config;

import lombok.AllArgsConstructor;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.stereotype.Component;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.List;

/**
 * swagger统一汇总管理
 *
 * @author yang
 */
@Component
@AllArgsConstructor
public class CustomSwaggerResourceProvider implements SwaggerResourcesProvider {
  /** Swagger2默认的url后缀 */
  public static final String SWAGGER2URL = "/v2/api-docs";
  /** 网关路由 */
  private final RouteLocator routeLocator;

  private final GatewayProperties gatewayProperties;
  /**
   * 聚合其他服务接口
   *
   * @return
   */
  @Override
  public List<SwaggerResource> get() {
    List<SwaggerResource> resourceList = new ArrayList<>();
    List<String> routes = new ArrayList<>();
    // 获取网关中配置的route
    routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
    gatewayProperties.getRoutes().stream()
        .filter(routeDefinition -> routes.contains(routeDefinition.getId()))
        .forEach(
            routeDefinition ->
                routeDefinition.getPredicates().stream()
                    .filter(
                        predicateDefinition ->
                            "Path".equalsIgnoreCase(predicateDefinition.getName()))
                    .forEach(
                        predicateDefinition ->
                            resourceList.add(
                                swaggerResource(
                                    routeDefinition.getId(),
                                    predicateDefinition
                                        .getArgs()
                                        .get(NameUtils.GENERATED_NAME_PREFIX + "0")
                                        .replace("/**", SWAGGER2URL)
                                    // 这里拼接时需要注意
                                    // 网关配置account映射到account-service，要么将网关的配置修改成account-service映射成account-service
                                    // 要么就在这个拼接处解决
                                    ))));
    return resourceList;
  }

  private SwaggerResource swaggerResource(String name, String location) {
    SwaggerResource swaggerResource = new SwaggerResource();
    swaggerResource.setName(name);
    swaggerResource.setLocation(location);
    swaggerResource.setSwaggerVersion("2.0");
    return swaggerResource;
  }
}
